ok so yesterday morning my car was running good and everything.. then I was driving home comping across the bayside bridge doing like 60 then out of no where it bogs down then BOOM! crazy ass loud back fire.. blew my whole exhaust apart and all the way across the bridge it would like bog then go then bog then go then when I got off the bridge it died in the middle lane on eastbay so ya get it towed to a friends shop and we start looking for problems take off the valve cover and set it to tdc and it looked like it skipped a tooth so we take it all apart and put on a new timing belt and it still doesnt start so we take the cap off the dizzy.. well I guess the kid that had the car before me (i've only had the car 2 months) either didnt tighted the rotor down enough or it just came lose or some weird shit so we tighten it and woohoo its fixed.. but now my temp guage like goes from normal temp to like I guess a quarter before the H then goes back down and like does it repetedly while driving... not sure what this could be :-X any help